PHP-Wkhtml library not working after installation

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http://stackoverflow.com – I have installed the wkhtml library in my fedora17 os for converting the html file into pdf.I followed the following link for this:- http://roundhere.net/journal/install-wkhtmltopdf-php-bindings/ But after installing the extension I puted the exention=phpwkhtmltox.so line into php.ini file and restart the apache server. But when I tried to execute php file then brower download that file into my system except to execute that file. Can any one tell to me what is thereason behind this? (HowTos)